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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baca4290bd8378396847645505abe0db2c06038574bc9209f9af23eaea24923a' 
  AND token = 'Dif/nIMrDR7HQqVVqfi93FJmZBuaSn5gjmUJUljbu18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}